Improvement in hoisting-machines



waited ginie- MICHAEL K.' CARPENTER, OF CINCINNATI, OHIC,

Letters Patent N0..90,26, dated May 18, 1869.

MPROVEMENT .IN HOISTING-MACEINES.

The Schedule referred to in these Lettere Patent and making part of the same.

To all whom c't may concern Be it known that I, MICHAEL K. CARPENTER, of Cincinnati, Hamilton county, State of Ohio, have invented a certain new and useful Improvement in Hoisting-Machines; and I do hereby declare the following to be a suiciently full, clear, and exact description thereof, to enable one skilled iu the art to which my invention appertains, to make and use it, reference being had tothe accompanying drawings, making part of this specification.

My invention consists of certain devices, which, though they add but slight friction to the machine in ordinary operation, serve to eiiectually support the platform in a safe, positive manner, in the event of the breakage of the hoisting-rope or chain.

In the accompanying drawings- Figure .1 is an isometric view of the parts of a hoisting-machine embodying my invention'.

Figure 2\ is a side View of a portion of the saine.

'lhe platform A has, firmlyv secured to fit, the side bars B B', in which the shaft C is journalled.

Horizontal projections, I) D', are secured to bars B B', and between these projections the slides E E are tted, to have a sliding reciprocating motion horizontally.

rlthe platform A. is operated by the rope, or chain F, which passes ovelI the pulley G on shaft C.

The rope, or chain F is secured at one end, and wound and unwound, to raise and lower the platform, by suitable mechanism attached to the other end.

The shaft C has formed upon it, at each end, inside the journals, two cams, H H', which revolve in the circular apertures in the vertically-sliding plates I I.

At the back ofeacb ofthe slidesE E are two projecting pins, or studs, a a.

As the platform is raised or lowered, the studs a a' follow closely against the curved ways J J', which are securely fastenedto the upright timbers on the sides of the hatchway, in convenient lengths.

the curved ways J J;

The platform A is confined to a straight vertical path by means of the bars B B', which slide between` the straight inside edges of the ways J J.

Operation.

It will he clearly understood, by reference to the accompanying drawings, and the foregoing description of parts, that, as the platform is raised or lowered by the chain F, the shaft C is revolved, the slides E E' reciprocated by cams H H', and the studs a a' follow The 4weight of the platform rests wholly on the shaft C, and in the operation of the machine there is no friction of practical consequence attending the movements of cams and slides.

In the event of thebreakage of the rope or chain, it is impossible for the platform to fall, inasmuch as it cannot move at all without a corresponding rotation ofthe shaft C, and it is practically impossible for the slides E E to so act upon the cams H H as to cause f the shaft C to revolve.

As a slight modification in construction, the slides I I may be omittedand the cams H H made of such size as to fit the inside vertical sides of the slides E E. V Another modification may `consist in having the pulley G on a separate shaft, and gearing so as to run the shaft C faster, for greater safety. v

I claim hereinas new, and of my invention- The cams H H-, slides E E', c a', and curved ways Jr J', in the described connection, o1l` relation to each other, in the herein-described hoisting-machine, and constructed and operating substantially in the manner and for the purpose specified. l In testimony of which invention, I hereunto set my Y M. K. CARPENTER.. Witnesses:

JEROME DU Bols,

E. A. DossMANN. 

